WO2010035971A2 - Method for supporting context management by home node-b - Google Patents

Method for supporting context management by home node-b Download PDF

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Publication number
WO2010035971A2
WO2010035971A2 PCT/KR2009/005179 KR2009005179W WO2010035971A2 WO 2010035971 A2 WO2010035971 A2 WO 2010035971A2 KR 2009005179 W KR2009005179 W KR 2009005179W WO 2010035971 A2 WO2010035971 A2 WO 2010035971A2
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WIPO (PCT)
Prior art keywords
henb
mme
context information
context
local routing
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PCT/KR2009/005179
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French (fr)
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WO2010035971A3 (en
Inventor
Huarui Liang
Tae-Sun Yeoum
Xiaoqiang Li
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Samsung Electronics Co., Ltd.
Beijing Samsung Telecom R&D Center
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Priority to US13/120,798 priority Critical patent/US20110182244A1/en
Publication of WO2010035971A2 publication Critical patent/WO2010035971A2/en
Publication of WO2010035971A3 publication Critical patent/WO2010035971A3/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/082—Mobility data transfer for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to communication field and particularly to a method for managing UE context by a Home Evolved NodeB (HENB).
  • HENB Home Evolved NodeB
  • a User Equipment (UE) 101 is a terminal device for receiving data.
  • a EUTRAN (Evolved UMTS Terrestrial Radio Access Network) 102 also referred to as Evolved NodeB (ENB), is a radio access network of System Architecture Evolution (SAE) for providing an interface through which a LTE mobile phone can access a radio network.
  • the EUTRAN 102 is connected to a mobility management entity (MME) 103 of the mobile phone and a serving gateway 104, which is a user plane entity, through a S1 interface.
  • MME mobility management entity
  • the serving gateway 104 primarily provides user plane functionality.
  • a S1-MME interface is used to provide the UE with radio access bearer setup and forward messages transmitted from the UE to the MME over the radio access network.
  • the combined function of the MME 103 and the serving gateway 104 is similar to that of the original SGSN (Serving General Packet Radio Service (GPRS) Support Node) 108. It is possible that both the MME and the serving gateway are located at a common physical entity.
  • a PDN gateway 105 is responsible for functions such as billing, lawful interception and the like. In addition, it is possible that both the serving gateway and the PDN gateway are located at a common physical entity.
  • a SGSN 108 is used to provide routing for data transmission in the existing UMTS.
  • the existing SGSN finds a corresponding Gateway GPRS Support Node (GGSN) according to an Access Point Name (APN).
  • a Home Subscriber Server (HSS) 109 is a home subscriber sub-system for the UE, configured to store user information such as the current location of the UE, the address of the serving node, user information on security, packet data protocol (PDP) context activated by the UE and the like.
  • PDP packet data protocol
  • a PCRF 106 provides QoS policy and billing rules through a S7 interface.
  • a HENB system resides in the E-UTRAN 102. It is not yet determined whether or not a HENB system should comprise two nodes, a HENB and a HENB-GW.
  • the HENB is deployed in a user's home, while the HENB-GW is deployed in an operator network if there is the HENB-GW in the HENB system.
  • the HENB and H-GW there is no final agreement on the specific functionality partition for the HENB and H-GW. According to the latest discussion, it is likely that the H-GW exists in a HENB system, and it is thus necessary to transmit a S1-AP message from the HNB to the H-GW from which the message is forwarded to the MME.
  • the HENB supports a function of local routing optimization, including accessing Internet directly by the HENB without passing through any core network node such that the routing for user data can be reduced. If the HENB supports the local routing optimization function, it is necessary to add respective functions of S-GW and P-GW to the HENB. Further, the HENB, S-GW and P-GW can be located at a common physical entity.
  • the present invention provides a method for paging an idle terminal when the HENB supports the local routing optimization function.
  • the object of the present invention is to provide a method for managing user context by a HENB, capable of guaranteeing a terminal to receive downlink signaling, such as paging, from a HENB system when the HENB system provides local routing optimization.
  • a method for managing user context by a HENB which comprises steps of:
  • MME mobility management entity
  • a terminal can receive downlink signaling after activation of a local routing optimization service by the terminal.
  • Fig. 1 shows a network structure for a SAE system
  • Fig. 2 shows a first flow for releasing S1
  • Fig. 3 shows a second flow for releasing S1
  • Fig. 4 shows a third flow for releasing S1
  • Fig. 5 shows interaction between a MME and a HENB/H-GW
  • Fig. 6 shows a flow for paging a terminal in a HENB system
  • Fig. 7 shows a flow in which a UE moves from a HENB area to a macro ENB area
  • Fig. 8 shows a process for activating local routing optimization service.
  • a flow for releasing S1 is illustrated in Fig. 2.
  • a logical entity, S-GW/P-GW in HENB refers to S-GW/P-GW functional module in a HENB entity.
  • the HENB upon detecting the disconnection of air interface, the HENB triggers the release of S1 connection and transmits a UE context release request message to the H-GW from which the S1-AP message is forwarded to the MME. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
  • UE context information stored in the HENB can be classified into two types, the first type being session management context information which includes an EPS bearer context information corresponding to the S-GW and the P-GW, and the second type being non-session management context information/mobility management context information.
  • the HENB When a terminal is transferred from an active state to an idle state, the HENB only releases the second type of mobility management context while reserving the first type of session management context based on the active local routing optimization service, such that the terminal can be guaranteed to receive downlink signaling.
  • the MME detects that the UE has an active local routing optimization service based on the UE context.
  • the MME transmits to the HENB a bearer update request message carrying identification indicating the support for the local routing optimization service.
  • the HENB reserves the first type of UE context information based on the identification.
  • the HENB transmits to the MME a bearer update response message which includes the identification indicating the support for the local routing optimization service if the HENB has reserved the first type of UE context information. However, this identification is optional.
  • the MME can reserve information which the HENB uses for the user plane, such as an address and a tunnel ID, directly based on the user context information.
  • the MME reserves the information which the HENB uses for the user plane, such as an address and a tunnel ID.
  • the MME transmits a S1-AP: UE context release response message to the HENB in order to request the release of the S1 connection.
  • the S1-AP message is first transmitted to the H-GW from which the message is forwarded to the HNB. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
  • the HENB transmits a UE context release complete message to the MME to confirm the completion of S1 connection release.
  • a flow for releasing S1 is illustrated in Fig. 3.
  • Fig. 3 a flow for releasing S1 is illustrated in Fig. 3.
  • the detailed description of Fig. 3 is given, in which technical details irrelevant to the present invention are omitted.
  • the first and second embodiments are two alternatives both applicable to the S1 release procedure when the UE is transferred from an active state to an idle state.
  • the first and second embodiments each comprise H-GW node.
  • the signaling in the respective procedures does not involve the H-GW node since the messages transmitted from the HENB to H-GW is the same as the messages transmitted from the HENB to the MME.
  • the HENB upon detecting the disconnection of air interface, the HENB triggers the release of S1 connection and transmits a UE context release request message to the H-GW from which the S1-AP message is forwarded to the MME. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
  • the MME detects that the UE has an active local routing optimization service based on the UE context.
  • the MME transmits to the HENB a bearer update request message carrying identification indicating the support for the local routing optimization service.
  • the HENB reserves the first type of UE context information based on the identification and releases other UE context information.
  • the HENB transmits to the MME a bearer update response message which includes the identification indicating the support for the local routing optimization service if the HENB has reserved the first type of UE context information. However, this identification is optional.
  • the MME can reserve information which the HENB uses for the user plane, such as an address and a tunnel ID, directly based on the user context information.
  • the MME reserves the information which the HENB uses for the user plane, such as an address and a tunnel ID.
  • the MME transmits a S1-AP: UE context release response message to the HENB in order to request the release of the S1 connection.
  • the S1-AP message is first transmitted to the H-GW from which the message is forwarded to the HNB. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
  • the HENB transmits a UE context release complete message to the MME to confirm the completion of S1 connection release.
  • the S1-AP message is first transmitted to the H-GW from which the message is forwarded to the HNB. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
  • a flow for releasing S1 is illustrated in Fig. 4.
  • Fig. 4 a flow for releasing S1 is illustrated in Fig. 4.
  • the detailed description of Fig. 4 is given, in which technical details irrelevant to the present invention are omitted.
  • the first, second and third embodiments are alternate schemes all applicable to the S1 release procedure when the UE transits from an active state to an idle state.
  • the first, second and third embodiments each comprise H-GW node.
  • the signaling in the respective procedures does not involve the H-GW node since the messages transmitted from the HENB to H-GW is the same as the messages transmitted from the HENB to the MME.
  • the HENB upon detecting the disconnection of air interface, the HENB triggers the release of S1 connection and transmits a UE context release request message to the MME.
  • the MME detects that the UE has an active local routing optimization service based on the UE context.
  • the MME transmits to the HENB a bearer update request message carrying identification indicating the support for the local routing optimization service.
  • the HENB reserves the first type of UE context information based on the identification and releases other UE context information.
  • the HENB transmits to the MME a UE context release complete message carrying identification indicating the support for the local routing optimization service, in order to confirm the completion of S1 connection release.
  • this identification is optional.
  • the MME can reserve information which the HENB uses for the user plane, such as an address and a tunnel ID, directly based on the user context information.
  • the MME reserves the information which the HENB uses for the user plane, such as an address and a tunnel ID.
  • an interaction between the HENB/H-GW and the MME is further described as supplement to the S1 release procedures according to the proceeding embodiments.
  • a processing mechanism for supporting the release procedure by the MME and the HENB is described.
  • Either the MME or the HENB has the right to decide whether the HENB should reserve the first type of UE context information.
  • the MME has the right to make following decisions.
  • the MME decides that the HENB should reserve the first type of UE context information.
  • the MME transmits a request message to the HENB requesting the HENB to reserve the first type of UE context information.
  • This message is applied in steps 202-203 of the first embodiment, the steps 302-303 of the second embodiment and steps 402-403 of the third embodiment.
  • the HENB receives the request message carrying identification indicating the support for the local routing optimization, based on which the HENB reserves the first type of UE context information.
  • This message is applied in step 204 of the first embodiment, step 304 of the second embodiment and step 404 of the third embodiment.
  • the HENB has the right to make following decisions.
  • the MME transmits to the HENB a request message carrying identification indicating the support for the local routing optimization.
  • This message is applied in steps 202-203 of the first embodiment, the steps 302-303 of the second embodiment and steps 402-403 of the third embodiment.
  • the HENB receives the request message including the identification, and decides to reserve the first type of UE context information.
  • This message is applied in step 204 of the first embodiment, step 304 of the second embodiment and step 404 of the third embodiment.
  • a paging flow initiated by the local HENB is illustrated in Fig. 6.
  • downlink data can be directly transmitted to the HENB.
  • the HENB transmits a downlink data notification to the corresponding MME according to identification of the UE.
  • the MME replies a downlink data notification acknowledgement message to the HENB.
  • the MME transmits a paging request to the HENB if the UE context information is stored in the MME.
  • the HENB directly initiates a UE paging process if it finds out the corresponding UE context information according to the identification of the UE.
  • the UE After receiving a paging message, the UE initiates a service request process whose description is omitted herein as being identical to that defined in existing specifications.
  • downlink data can be directly transmitted to the HENB.
  • the HENB transmits a downlink data notification to the corresponding MME according to identification of the UE. This step is optional and can be skipped if it is not required to update the UE context information in the MME.
  • the HENB pages the UE in its area.
  • the UE initiates a service request process based on receipt of the paging message.
  • a scenario in which a UE moves to a macro ENB is described.
  • the process for paging a UE in such case is illustrated in Fig. 7.
  • a TAU procedure occurs or not.
  • the HENB reserves the first type of UE context information in both cases, downlink data may be transmitted to both the HENB and the P-GW when the UE moves to the macro ENB area.
  • both processes for paging UE according to the sixth embodiment and according to the existing procedure may be performed. Therefore, there is redundancy in signaling to the MME. Thus, the following optimization for the paging process is considered.
  • the S1-AP message carries no special identification indicating the support for local routing optimization.
  • the HENB deletes all context information related to the UE including the first type of UE context information. The details of the TAU procedure are omitted herein as being identical to the prior art.
  • the HENB sets a timer when it stores the first type of UE context information. If the timer timed out, the HENB deletes the first type of UE context information.
  • an activation process for the local routing optimization is illustrated in Fig. 8.
  • the UE transmits a PDN connection setup request message to the MME, requesting to activate the local routing optimization service.
  • the MME knows the activation request is one requesting to activate the local routing optimization service and can obtain the HENB address according to the S1 connection setup message from the HENB.
  • the MME transmits a default bearer setup request message to the HENB.
  • the HENB updates the stored user plane information for the UE and transmits a default bearer setup response message to the MME.
  • the MME updates the user plane routing information for the UE.

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Abstract

A method for managing user context by a Home Evolved NodeB (HENB) is provided, which comprises steps of: requesting, by a mobility management entity (MME), the HENB to reserve a first type of UE context information; obtaining, by the HENB, the MME of the UE according to the first type of UE context information after receiving data; and notifying, by the HENB, the MME of arrival of the data. With the method according to the present invention, it is guaranteed by a HENB system that a terminal can receive downlink signaling after activation of a local routing optimization service by the terminal.

Description

METHOD FOR SUPPORTING CONTEXT MANAGEMENT BY HOME NODE-B
The present invention relates to communication field and particularly to a method for managing UE context by a Home Evolved NodeB (HENB).
The system structure of SAE as illustrated in Fig. 1 is described in the following.
A User Equipment (UE) 101 is a terminal device for receiving data. A EUTRAN (Evolved UMTS Terrestrial Radio Access Network) 102, also referred to as Evolved NodeB (ENB), is a radio access network of System Architecture Evolution (SAE) for providing an interface through which a LTE mobile phone can access a radio network. The EUTRAN 102 is connected to a mobility management entity (MME) 103 of the mobile phone and a serving gateway 104, which is a user plane entity, through a S1 interface. The MME 103 is used to manage mobility context and session context of the UE and to store user information on security. The serving gateway 104 primarily provides user plane functionality. A S1-MME interface is used to provide the UE with radio access bearer setup and forward messages transmitted from the UE to the MME over the radio access network. The combined function of the MME 103 and the serving gateway 104 is similar to that of the original SGSN (Serving General Packet Radio Service (GPRS) Support Node) 108. It is possible that both the MME and the serving gateway are located at a common physical entity. A PDN gateway 105 is responsible for functions such as billing, lawful interception and the like. In addition, it is possible that both the serving gateway and the PDN gateway are located at a common physical entity. A SGSN 108 is used to provide routing for data transmission in the existing UMTS. The existing SGSN finds a corresponding Gateway GPRS Support Node (GGSN) according to an Access Point Name (APN). A Home Subscriber Server (HSS) 109 is a home subscriber sub-system for the UE, configured to store user information such as the current location of the UE, the address of the serving node, user information on security, packet data protocol (PDP) context activated by the UE and the like. A PCRF 106 provides QoS policy and billing rules through a S7 interface.
So far, a HENB system resides in the E-UTRAN 102. It is not yet determined whether or not a HENB system should comprise two nodes, a HENB and a HENB-GW. The HENB is deployed in a user's home, while the HENB-GW is deployed in an operator network if there is the HENB-GW in the HENB system. However, there is no final agreement on the specific functionality partition for the HENB and H-GW. According to the latest discussion, it is likely that the H-GW exists in a HENB system, and it is thus necessary to transmit a S1-AP message from the HNB to the H-GW from which the message is forwarded to the MME.
The HENB supports a function of local routing optimization, including accessing Internet directly by the HENB without passing through any core network node such that the routing for user data can be reduced. If the HENB supports the local routing optimization function, it is necessary to add respective functions of S-GW and P-GW to the HENB. Further, the HENB, S-GW and P-GW can be located at a common physical entity.
So far, there is no specific definition in current specifications with respect to the functionality of the HENB for supporting local routing optimization. According to existing specifications, when a terminal is transfered from an active state to an idle state, it is necessary for the HENB to release all context information associated with the UE. In such case, however, a UE belonging to the HENB cannot be paged. The present invention provides a method for paging an idle terminal when the HENB supports the local routing optimization function.
The object of the present invention is to provide a method for managing user context by a HENB, capable of guaranteeing a terminal to receive downlink signaling, such as paging, from a HENB system when the HENB system provides local routing optimization.
To achieve the object above, a method for managing user context by a HENB is provided, which comprises steps of:
requesting, by a mobility management entity (MME), the HENB to reserve a first type of UE context information;
obtaining, by the HENB, the MME of the UE according to the first type of UE context information after receiving data; and
notifying, by the HENB, the MME of arrival of the data.
With the method according to the present invention, it is guaranteed by a HENB system that a terminal can receive downlink signaling after activation of a local routing optimization service by the terminal.
Fig. 1 shows a network structure for a SAE system;
Fig. 2 shows a first flow for releasing S1;
Fig. 3 shows a second flow for releasing S1;
Fig. 4 shows a third flow for releasing S1;
Fig. 5 shows interaction between a MME and a HENB/H-GW;
Fig. 6 shows a flow for paging a terminal in a HENB system;
Fig. 7 shows a flow in which a UE moves from a HENB area to a macro ENB area; and
Fig. 8 shows a process for activating local routing optimization service.
According to the first embodiment of the present invention, a flow for releasing S1 is illustrated in Fig. 2.
In the following, the detailed description of Fig. 2 is given, in which technical details irrelevant to the present invention are omitted. In the dashed block shown in Fig. 2, a logical entity, S-GW/P-GW in HENB, refers to S-GW/P-GW functional module in a HENB entity.
At 201, upon detecting the disconnection of air interface, the HENB triggers the release of S1 connection and transmits a UE context release request message to the H-GW from which the S1-AP message is forwarded to the MME. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME. UE context information stored in the HENB can be classified into two types, the first type being session management context information which includes an EPS bearer context information corresponding to the S-GW and the P-GW, and the second type being non-session management context information/mobility management context information. When a terminal is transferred from an active state to an idle state, the HENB only releases the second type of mobility management context while reserving the first type of session management context based on the active local routing optimization service, such that the terminal can be guaranteed to receive downlink signaling.
At 202, the MME detects that the UE has an active local routing optimization service based on the UE context.
At 203, based on the fact that the UE has an active local routing optimization service, the MME transmits to the HENB a bearer update request message carrying identification indicating the support for the local routing optimization service.
At 204, the HENB reserves the first type of UE context information based on the identification.
At 205, the HENB transmits to the MME a bearer update response message which includes the identification indicating the support for the local routing optimization service if the HENB has reserved the first type of UE context information. However, this identification is optional. The MME can reserve information which the HENB uses for the user plane, such as an address and a tunnel ID, directly based on the user context information.
At 206, after receiving the response message, the MME reserves the information which the HENB uses for the user plane, such as an address and a tunnel ID.
At 207, the MME transmits a S1-AP: UE context release response message to the HENB in order to request the release of the S1 connection. The S1-AP message is first transmitted to the H-GW from which the message is forwarded to the HNB. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
At 208, a process for releasing RRC connection is performed, whose details are omitted herein as being identical to the prior art.
At 209, the HENB transmits a UE context release complete message to the MME to confirm the completion of S1 connection release.
According to the second embodiment of the present invention, a flow for releasing S1 is illustrated in Fig. 3. In the following, the detailed description of Fig. 3 is given, in which technical details irrelevant to the present invention are omitted.
The first and second embodiments are two alternatives both applicable to the S1 release procedure when the UE is transferred from an active state to an idle state.
The first and second embodiments each comprise H-GW node. However, the signaling in the respective procedures does not involve the H-GW node since the messages transmitted from the HENB to H-GW is the same as the messages transmitted from the HENB to the MME.
At 301, upon detecting the disconnection of air interface, the HENB triggers the release of S1 connection and transmits a UE context release request message to the H-GW from which the S1-AP message is forwarded to the MME. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
At 302, the MME detects that the UE has an active local routing optimization service based on the UE context.
At 303, based on the fact that the UE has an active local routing optimization service, the MME transmits to the HENB a bearer update request message carrying identification indicating the support for the local routing optimization service.
At 304, the HENB reserves the first type of UE context information based on the identification and releases other UE context information.
At 305, the HENB transmits to the MME a bearer update response message which includes the identification indicating the support for the local routing optimization service if the HENB has reserved the first type of UE context information. However, this identification is optional. The MME can reserve information which the HENB uses for the user plane, such as an address and a tunnel ID, directly based on the user context information.
At 306, after receiving the response message, the MME reserves the information which the HENB uses for the user plane, such as an address and a tunnel ID.
At 307, the MME transmits a S1-AP: UE context release response message to the HENB in order to request the release of the S1 connection. The S1-AP message is first transmitted to the H-GW from which the message is forwarded to the HNB. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
At 308, a process for releasing RRC connection is performed, whose details are omitted herein as being identical to the prior art.
At 309, the HENB transmits a UE context release complete message to the MME to confirm the completion of S1 connection release. The S1-AP message is first transmitted to the H-GW from which the message is forwarded to the HNB. If there is no H-GW in the LTE HENB architecture, the S1-AP message is directly transmitted from the HNB to the MME.
According to the third embodiment of the present invention, a flow for releasing S1 is illustrated in Fig. 4. In the following, the detailed description of Fig. 4 is given, in which technical details irrelevant to the present invention are omitted.
The first, second and third embodiments are alternate schemes all applicable to the S1 release procedure when the UE transits from an active state to an idle state.
The first, second and third embodiments each comprise H-GW node. However, the signaling in the respective procedures does not involve the H-GW node since the messages transmitted from the HENB to H-GW is the same as the messages transmitted from the HENB to the MME.
At 401, upon detecting the disconnection of air interface, the HENB triggers the release of S1 connection and transmits a UE context release request message to the MME.
At 402, the MME detects that the UE has an active local routing optimization service based on the UE context.
At 403, based on the fact that the UE has an active local routing optimization service, the MME transmits to the HENB a bearer update request message carrying identification indicating the support for the local routing optimization service.
At 404, the HENB reserves the first type of UE context information based on the identification and releases other UE context information.
At 405, a process for releasing RRC connection is performed, whose details are omitted herein as being identical to the prior art.
At 406, the HENB transmits to the MME a UE context release complete message carrying identification indicating the support for the local routing optimization service, in order to confirm the completion of S1 connection release. However, this identification is optional. The MME can reserve information which the HENB uses for the user plane, such as an address and a tunnel ID, directly based on the user context information.
At 407, after receiving the response message, the MME reserves the information which the HENB uses for the user plane, such as an address and a tunnel ID.
According to the fourth embodiment of the present invention, an interaction between the HENB/H-GW and the MME is further described as supplement to the S1 release procedures according to the proceeding embodiments. In this embodiment, a processing mechanism for supporting the release procedure by the MME and the HENB is described.
Either the MME or the HENB has the right to decide whether the HENB should reserve the first type of UE context information.
The MME has the right to make following decisions.
At 501, upon detecting that the UE has an active local routing optimization service, the MME decides that the HENB should reserve the first type of UE context information. The MME transmits a request message to the HENB requesting the HENB to reserve the first type of UE context information.
This message is applied in steps 202-203 of the first embodiment, the steps 302-303 of the second embodiment and steps 402-403 of the third embodiment.
At 502, the HENB receives the request message carrying identification indicating the support for the local routing optimization, based on which the HENB reserves the first type of UE context information.
This message is applied in step 204 of the first embodiment, step 304 of the second embodiment and step 404 of the third embodiment.
The HENB has the right to make following decisions.
At 501, upon detecting that the UE has an active local routing optimization service, the MME transmits to the HENB a request message carrying identification indicating the support for the local routing optimization.
This message is applied in steps 202-203 of the first embodiment, the steps 302-303 of the second embodiment and steps 402-403 of the third embodiment.
At 502, the HENB receives the request message including the identification, and decides to reserve the first type of UE context information.
This message is applied in step 204 of the first embodiment, step 304 of the second embodiment and step 404 of the third embodiment.
According to the sixth embodiment of the present invention, a paging flow initiated by the local HENB is illustrated in Fig. 6.
In the following, the detailed description of Fig. 6 is given, in which technical details irrelevant to the present invention are omitted.
At 601, if the HENB supports the local routing optimization service and reserves the first type of UE context information when the UE transits back to the idle state, downlink data can be directly transmitted to the HENB.
At 602, the HENB transmits a downlink data notification to the corresponding MME according to identification of the UE.
At 603, the MME replies a downlink data notification acknowledgement message to the HENB.
At 604, the MME transmits a paging request to the HENB if the UE context information is stored in the MME.
At 605, after receiving the paging request, the HENB directly initiates a UE paging process if it finds out the corresponding UE context information according to the identification of the UE.
At 606, after receiving a paging message, the UE initiates a service request process whose description is omitted herein as being identical to that defined in existing specifications.
There are different possibilities for the paging process initiated by the local HENB with the sixth embodiment being one possibility and the seventh embodiment being the other.
At 701, if the HENB supports the local routing optimization service and reserves the first type of UE context information when the UE is transferred back to the idle state, downlink data can be directly transmitted to the HENB.
At 702, the HENB transmits a downlink data notification to the corresponding MME according to identification of the UE. This step is optional and can be skipped if it is not required to update the UE context information in the MME.
At 703, the HENB pages the UE in its area.
At 704, the UE initiates a service request process based on receipt of the paging message.
According to the eighth embodiment, a scenario in which a UE moves to a macro ENB is described. In this case, there is UE context information in both a P-GW and a HENB supporting local routing optimization service. The process for paging a UE in such case is illustrated in Fig. 7.
When the UE is transferred back to an idle state, there are two possibilities if the UE moves from the HENB area to a macro ENB area as illustrated in Fig. 7: a TAU procedure occurs or not. If the HENB reserves the first type of UE context information in both cases, downlink data may be transmitted to both the HENB and the P-GW when the UE moves to the macro ENB area. In this way, both processes for paging UE according to the sixth embodiment and according to the existing procedure may be performed. Therefore, there is redundancy in signaling to the MME. Thus, the following optimization for the paging process is considered.
When a TAU procedure occurs in the UE and the MME transmits a S1 release message to the HENB, the S1-AP message carries no special identification indicating the support for local routing optimization. After receiving the S1-AP message, the HENB deletes all context information related to the UE including the first type of UE context information. The details of the TAU procedure are omitted herein as being identical to the prior art.
If no TAU procedure occurs in the UE, the HENB sets a timer when it stores the first type of UE context information. If the timer timed out, the HENB deletes the first type of UE context information.
According to the eighth embodiment of the present invention, an activation process for the local routing optimization is illustrated in Fig. 8.
In the following, the detailed description of Fig. 8 is given, in which technical details irrelevant to the present invention are omitted.
At 801, the UE transmits a PDN connection setup request message to the MME, requesting to activate the local routing optimization service.
At 802, there are two approaches for the MME to find the address of the HENB:
According to the first approach, at 802a,theMMEobtainsinformationonthe support for the local routing optimization service according to the subscription data from the HSS. Based on the information, the corresponding P-GW address and thus the HENB address can be obtained as the HENB and the P-GW being the same entity.
According to the first approach, at 802b, the MME knows the activation request is one requesting to activate the local routing optimization service and can obtain the HENB address according to the S1 connection setup message from the HENB.
At 803, the MME transmits a default bearer setup request message to the HENB.
At 804, the HENB updates the stored user plane information for the UE and transmits a default bearer setup response message to the MME.
At 805, after receiving the response message, the MME updates the user plane routing information for the UE.
At 806, a process for releasing RRC connection is performed, whose details are omitted herein as being identical to the prior art.
While the present invention has been described in the foregoing embodiments, it should be noted that these embodiments are illustrative only and cannot be construed as limiting the present invention. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention defined by the appended claims.

Claims (13)

  1. A method for managing user context by a Home Evolved NodeB (HENB), comprising steps of:
    requesting, by a mobility management entity (MME), the HENB to reserve a first type of UE context information;
    obtaining, by the HENB, the MME of the UE according to the first type of UE context information after receiving data; and
    notifying, by the HENB, the MME of arrival of the data.
  2. The method of claim 1, wherein the MME detects an active local routing optimization service based on the UE context information.
  3. The method of claim 2, wherein the message transmitted from the MME to the HENB carries identification indicating the support for the local routing optimization.
  4. The method of claim 3, wherein the first type of UE context information is EPS bearer context information corresponding to S-GW and a P-GW.
  5. The method of claim 3, further comprising:
    transmitting, by the MME, a UE context release response message to the HENB in order to request to release a S1 connection.
  6. The method of claim 5, wherein the message for S1 connection release includes identification indicating the support for the local routing optimization.
  7. The method of claim 1, wherein the message transmitted from the MME to the HENB is a bearer update request message.
  8. The method of claim 1, wherein the message transmitted from the MME to the HENB is a UE context release response message.
  9. The method of claim 1,wherein the HENB transmits a response message to the MME after reserving the first type of UE context information.
  10. The method of claim 9, wherein the response message transmitted from the HENB to the MME is a bearer update response message.
  11. The method of claim 9, wherein the response message transmitted from the HENB to the MME is a UE context release complete message.
  12. The method of claim 9, wherein the response message transmitted from the HENB to the MME carries identification for the local routing optimization.
  13. The method of claim 12, further comprising:
    reserving, by the MME, information on an IP address and a tunnel ID, which the HENB uses for the user plane, after receiving the response message carrying identification for the local routing optimization.
PCT/KR2009/005179 2008-09-24 2009-09-11 Method for supporting context management by home node-b WO2010035971A2 (en)

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